Some environmentalists are pressing federal officials to declare parts of Arizona and New México critical habitat for jaguars. But local ranchers and many jaguar experts say such a move is unnecessary because the animals show no signs of breeding here.
And then there is the fence. If the Border Patrol builds a 700-mile barrier in the region to deter illegal immigration, the natural corridors used by jaguars and other migratory wildlife will be cut off. Jaguars are the largest native American cat. They once roamed much of the Southwest, but when ranchers took cattle to the region in the last century, the jaguars were trapped and hunted to extinction in the United States. The last known resident female was killed in 1963 near the Grand Canyon.
Jaguars were thought to be gone from the Southwest until Warner Glenn, a cattle rancher and mountain lion hunter, saw a live one in the Peloncillos Mountains, near the New Mexico border with México, on March 7, 1996.
"I thought the dogs had treed a lion, but when I went to look, it was a jaguar," Mr. Glenn said in an interview at his Malpai Ranch near Douglas, Ariz., where his office is decorated with poster-size photos of jaguars and the occasional plastic jaguar figurine.
Mr. Glenn raced back to his mule, pulled out a camera and snapped what seem to be the first photographs of a live jaguar in the United States, ever. Other known photographs show jaguars that were already dead. Sadly, the same cat was killed a few months later by a federal police officer in México, 30 miles from the United States border.
Working with conservation groups, Mr. Glenn helped place trip cameras in the Peloncillos in 2001. But within a few years, he said, four of the cameras disappeared, apparently taken by drug runners. "And we never got a picture of another jaguar," he said.
That changed last Feb. 20, when Mr. Glenn photographed his second jaguar while on a lion hunt in the Animas Mountains.
Shortly after lunch one of the hunting dogs, Powder, disappeared. "Then one of the cowboys found him and said he has a huge hole in his neck and shoulder," Mr. Glenn said. "Something had pounded the pudding out of Powder. I thought it might be a feral hog or a boar javelina. It couldn't be a lion. They don't mess with dogs."
Picking up a scent, Mr. Glenn's five other hounds took off. He gave chase and soon got to within a hundred yards of the commotion. "I looked up and in the shade of a big cedar tree, I could see a big cat, dark in the shade. I thought, they have a big tom lion," he said. "I moved in closer. The cat charged the dogs. They scattered like quail. Then I saw it was a jaguar."
Mr. Glenn grabbed his camera and started shooting. The jaguar caught another dog, Copper, bit him on the back and released him. When the hound Rietta moved in, the cat grabbed him with one paw, then another, and delivered two quick bites in the rump.
"The jaguar could have easily killed the dogs," Mr. Glenn said. "One bite to the head and they'd be gone. But he let them go on purpose." They were not seriously hurt. Moments later, the rest of the hunting party arrived, helped gather the dogs and looked on as the jaguar looked back at them, struck a trot and left. "He did not run," Mr. Glenn said. "He was not afraid of anything." Later he estimated that the jaguar, by the look of his teeth, was eight or nine years old and weighed nearly 200 pounds.
Mr. Glenn named the cat Border King. Another jaguar is now being tracked and photographed in southern Arizona by Jack Childs, a rancher and lion hunter from Tucson. Mr. Childs first videotaped the animal, which he nicknamed Macho B, in August 1996 in the Baboquivari Mountains. It left the region that year but came back in 2004, where it now wanders along the border.
Like all jaguars, Macho B has distinct black rosettes on his golden fur. A spot on his right rib cage looks like Pinocchio and one on his left rib looks like Betty Boop, Mr. Childs said. With support from the Arizona Game and Fish Department and other organizations, Mr. Childs now has nearly 50 trip cameras along the Arizona border with México south of Tucson. Macho B has been photographed 52 times in the last two years.